Aim: Few recent studies have been investigating the effect of clone on aroma compounds. The aim of this research work was to study the impact of certified clones from Vitis vinifera L. cv. Duras N on grape quality and rotundone, a sesquiterpene responsible for peppery aroma which has been reported recently in red wines made from this cultivar.
Methods and results:The experimental site consisted of four consecutive rows, each row planted with one of the four certified clones of Duras N (554, 555, 627 and 654). For each clone, measurements were replicated on three experimental units per row. Each experimental unit consisted of twelve continuous vines. Rotundone concentration was measured in wines prepared by microvinification techniques (1-L Erlenmeyer flasks). For both vintages of study, rotundone concentrations were significantly higher in wines from clones 554 and 654 in comparison with clone 555, while clone 627 showed an intermediate level. In 2014, differences in powdery mildew (PM) severity on clusters were identified between the four clones and a positive logarithmic correlation (r 2 = 0.58) was reported on the experimental site between rotundone in wines and PM severity on grapes.
Conclusion:Our results found differences in rotundone concentrations in wines made from the four Duras N certified clones. The results also suggested that grapevine defence response to PM could enhance rotundone production in berries. Clonal differences in susceptibility to biotic stress, such as PM, might explain the differences observed in rotundone concentrations between the four studied clones.Significance and impact of the study: Our results may assist grape growers to produce high quality wines with a desired aroma attribute made from Duras N. One should consider planting clone 554 in order to promote high levels of rotundone in wines made from this cultivar.Objectif : Peu d'études récentes ont étudié l'effet du clone sur les composés aromatiques. L'objectif de ce travail de recherche était d'évaluer l'impact des clones certifiés de Vitis vinifera L. cv. Duras N sur la qualité des raisins et la rotundone, un sesquiterpène responsable des arômes poivrés identifié récemment dans les vins élaborés à partir de ce cépage.
Méthodes et résultats: Le site expérimental se compose de quatre rangs consécutifs, chacun des rangs étant planté avec l'un des quatre clones certifiés de Duras N (554, 555, 627 et 654). Pour chacun des clones, les mesures ont été répétées sur trois placettes expérimentales par rang, chacune d'entre elle se composant de douze pieds consécutifs. La concentration en rotundone a été mesurée dans des vins élaborés en condition de microvinification (Erlenmeyer d'1 L). Pour les deux millésimes d'étude, les concentrations en rotundone ont été significativement supérieures dans les vins des clones 554 et 654 en comparaison avec le clone 555 alors que le clone 627 a présenté un niveau intermédiaire. En 2014, des différences d'intensité de dégâts d'oïdium ont été mises en évidence sur grappes entre les quatre clones et u...
Today’s breeding efforts applied to grapevines are mainly focused on the use of resistance to bio-aggressors, after beingmotivated, often unconsciously, for millennia by quantitative and qualitative concerns, and adaptations to environmentalconditions. Thanks to advances in genomic knowledge and use of molecular markers, it is now possible to envisage more andmore solutions against different pathogens (fungi, bacteria, viruses, insects), and in the near future, to ensure the durability ofthese resistances while combining them with resistance factors to abiotic stresses (drought, cold hardiness, soil conditions, etc.).This brief review presents the history and current situation of resistant vine types.
Aim: Rotundone and 3-isobutyl-2-methoxypyrazine (IBMP) are two potent aroma compounds responsible for pepper and bell pepper notes in red wines, respectively. The aim of the study was to modulate, through common viticultural practices, the volatile composition in these two molecules of Fer red wines from a temperate climate wine region with very cool nights, located in the southwest of France.Methods and results: Three viticultural practices (leaf removal 10 days after berry set, removal of lateral shoots, and delayed harvest 7 days after the control) were investigated in 2015 and in 2016. Rotundone concentrations up to 69 ng/L were found in experimental wines. IBMP concentrations were below perception level in wines from 2016 and below detection level in wines from 2015, a vintage with particularly hot climatic conditions between berry set and bunch closure. Delayed harvest induced an increase in rotundone concentration while leaf removal and the removal of lateral shoots had no significant impact on rotundone concentration. Delayed harvest and the removal of lateral shoots were the most efficient practices to decrease IBMP in wines. The three techniques made it possible to increase the odour activity values (OAV) ratio of OAV rotundone to OAV IBMP, with the greatest impact observed for delayed harvest.Conclusion: According to our results, delayed harvest appears to be the best practice to modulate the volatile composition of Fer wines toward an increase in the OAV rotundone to OAV IBMP ratio.Significance and impact of the study: Our results may assist local grape growers to modulate the volatile composition of their wines.
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